CN102162250B - Protective construction method of excavating large area deep foundation pit in running sand confined water soil layer - Google Patents
Protective construction method of excavating large area deep foundation pit in running sand confined water soil layer Download PDFInfo
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- CN102162250B CN102162250B CN201010113059A CN201010113059A CN102162250B CN 102162250 B CN102162250 B CN 102162250B CN 201010113059 A CN201010113059 A CN 201010113059A CN 201010113059 A CN201010113059 A CN 201010113059A CN 102162250 B CN102162250 B CN 102162250B
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Abstract
The invention discloses a protective construction method of excavating a large area deep foundation pit in a running sand confined water soil layer. The method comprises the steps of: firstly, controlling the precipitation depth of the deep foundation pit in a range of 500mm to 1000mm below the excavation surface; disposing a circle of sandless tubular wells around the outer periphery of the deep foundation pit, wherein each sandless tubular well is 2 meters far from the deep foundation pit edge, 6 to 10 meters deeper than the bottom of the deep foundation pit, and 15 to 20 meters far from the neighboring sandless tubular well; laying reinforcing steel mesh sheets and disposing a circle of light-duty wellpoints on an inward side slope of the deep foundation pit; after starting the excavation, arranging a soil nail wall provided with weep holes for anchoring on a side slope of silty sand layer and silty clay layer with silt seam. By the method in the invention, the excavation of the large area deep foundation pit in the running sand confined water soil layer is ensured to be smooth, with no need to enlarge the excavation area. The difficulty of construction and the construction cost are lowered and the construction period is shortened.
Description
Technical field
The present invention relates to a kind of drift sand artesian water soil layer large-area deep foundation pit excavation and go along with sb. to guard him job practices.
Background technology
It is the important procedure in the Deep Excavation that deep pit digging is gone along with sb. to guard him, and goes along with sb. to guard him the improper all kinds of faults that will cause in the digging process, serious causes caving in of deep foundation ditch; To drift sand artesian water soil layer, it is particularly important that it goes along with sb. to guard him work, as excavation place soil layer construction be first floor plough fill stratum, second layer argillic horizon, the 3rd layer of silty clay folder powder soil horizon, the 4th layer be powder fine sand layer; Powder fine sand layer is an artesian aquifer, and head height is a 6-7 rice, and is arranged in the deep pit digging layer; If this position bracing of foundation pit measure is improper, can cause behind soil excavation to the powder fine sand layer that powder fine sand layer pours in the foundation ditch under pressure in the foundation ditch, cause excavation slope and surrounding soil large tracts of land to be caved in, cause serious consequence.Because of the 3rd layer of foundation ditch, the 4th layer of soil property are silty clay folder powder soil horizon and powder fine sand layer; Stability is very poor; And the excavation slope gradient is by being designed with certain requirement; Should not be too big, so cause this position slump easily owing to excavation slope is smaller behind the excavation of foundation pit, particularly running into rainwater weather slump phenomenon can be more serious.
By job practices in the past; Run into the large-area deep foundation pit of similar geological conditions; Must carry out foundation ditch and put the slope excavation greatly behind release precipitation and the drainage precipitation on a large scale; The degree of depth of this foundation ditch must be put the slope by 1: 2 and just can be excavated, but also must carry out local stiffening at the position that specific (special) requirements is arranged.Adopt this excavation method foundation ditch can increase much because of putting sloping excavation area; Bigger to surrounding environment influence; When influencing like excavation spatial constraints or neighboring buildings, even can't excavation construction, when running into bigger rainwater weather; Because of the earthwork of rain drop erosion powder fine sand layer side slope can large tracts of land slump, the integral construction of foundation ditch brought have a strong impact on.
If excavation of foundation pit has restriction to the foundation ditch gradient, then need to take gravity shelves wall integral body to go along with sb. to guard him to foundation ditch, release precipitation is carried out in the foundation ditch periphery, and foundation ditch inside carries out just can carrying out earthwork construction behind the drainage precipitation.Adopt the method duration, cost increasing degree bigger, powder fine sand layer carries out ground stabilization to be handled construction quality and cannot say for sure card.
Summary of the invention
Technical problem to be solved by this invention provides a kind of drift sand artesian water soil layer large-area deep foundation pit excavation and goes along with sb. to guard him job practices; Utilize this method under the prerequisite that does not increase excavation area; Guarantee the excavation of drift sand artesian water soil layer large-area deep foundation pit; Reduce difficulty of construction and cost, reduced construction period.
For solving the problems of the technologies described above; Drift sand artesian water soil layer large-area deep foundation pit excavation of the present invention is gone along with sb. to guard him job practices; Drift sand artesian water soil layer is that first floor is ploughed fill stratum, second layer argillic horizon, the 3rd layer of silty clay folder powder soil horizon, the 4th layer of powder fine sand layer, and this method comprises the steps:
The precipitation depth of step 1, deep pit digging is controlled in the following 500-1000 millimeter of excavation face, reduces the influence to the deep foundation ditch surrounding environment;
Step 2, in the deep foundation ditch outer periphery the no sandpipe well of one circle is set, is used for reducing the 4th layer of powder fine sand layer artesian head height, 2 meters on no sandpipe well spacing deep foundation ditch limit, the degree of depth are greater than 6-10 rice bottom the deep foundation ditch, and the spacing of arranging of no sandpipe well is a 15-20 rice;
Step 3, on the inboard side slope of deep foundation ditch, lay reinforced mesh and a circle light well point is set, shutoff underground water infiltrates in foundation ditch, keeps the basicly stable of deep foundation pit slope;
On the side slope of silty clay folder powder soil horizon and powder fine sand layer, the soil nailing wall is set behind step 4, the deep pit digging and carries out anchoring, on the soil nailing wall drain hole is set.
Further, the soil nailing of above-mentioned soil nailing wall adopts grouted anchor bar, and grouted anchor bar is downward-sloping 10 degree along the deep foundation ditch bottom, and the anchor pole spacing is latticed for 1.5 meters arranges, and forms anchoring soil nailing body of wall with reinforced mesh welding back sprayed mortar that deep foundation pit slope is laid.
Further, above-mentioned drain hole adopts the UPVC pipe, and its length is that 300 millimeters and an end are arranged in the soil nailing body of wall with drainage spun yarn parcel and with the colligation of deep foundation pit slope reinforced mesh, and UPVC manages and becomes latticed along the soil nailing wall by 2 meters spacings and arrange.
Because drift sand artesian water soil layer large-area deep foundation pit excavation of the present invention is gone along with sb. to guard him job practices and has been adopted technique scheme; The precipitation depth of promptly controlling deep pit digging is in the following 500-1000 millimeter of excavation face; The deep foundation ditch outer periphery is provided with the no sandpipe well of a circle; 2 meters on no sandpipe well spacing deep foundation ditch limit, the degree of depth are 15-20 rice greater than deep foundation ditch bottom 6-10 rice, the spacing of arranging; The deep foundation ditch inslope is laid reinforced mesh and a circle light well point is set, and on the side slope of silty clay folder powder soil horizon and powder fine sand layer, the soil nailing wall is set behind the deep pit digging and carries out anchoring, on the soil nailing wall drain hole is set; This method is guaranteed the excavation of drift sand artesian water soil layer large-area deep foundation pit under the prerequisite that does not increase excavation area, reduced difficulty of construction and cost, has reduced construction period.
Description of drawings
The present invention is described in further detail below in conjunction with accompanying drawing and embodiment:
Fig. 1 is the sketch map of deep foundation ditch in the job practices of the present invention.
The specific embodiment
As shown in Figure 1; Drift sand artesian water soil layer large-area deep foundation pit excavation of the present invention is gone along with sb. to guard him job practices; Drift sand artesian water soil layer is that first floor is ploughed fill stratum 1, second layer argillic horizon 2, the 3rd layer of silty clay folder powder soil horizon 3, the 4th layer of powder fine sand layer 4, and this method comprises the steps:
The precipitation depth of step 1, deep pit digging is controlled in the following 500-1000 millimeter of excavation face, reduces the influence to the deep foundation ditch surrounding environment;
Step 2, in the deep foundation ditch outer periphery the no sandpipe well 5 of one circle is set, is used for reducing the 4th layer of powder fine sand layer 4 artesian head height, 2 meters apart from the deep foundation ditch limit in no sandpipe well 5, the degree of depth are greater than 6-10 rice bottom the deep foundation ditch, and the spacing of arranging of no sandpipe well is a 15-20 rice;
Step 3, on the inboard side slope of deep foundation ditch, lay reinforced mesh and a circle light well point 6 is set, shutoff underground water infiltrates in foundation ditch, keeps the basicly stable of deep foundation pit slope; Effective shutoff underground water that is provided with of light well point 6 infiltrates in deep foundation ditch, has kept the stability of deep foundation pit slope;
On the side slope of silty clay folder powder soil horizon 3 and powder fine sand layer 4, the soil nailing wall is set behind step 4, the deep pit digging and carries out anchoring; The pressure that artesian water causes the soil nailing wall when preventing that water level in the deep foundation ditch from rising makes soil nailing wall unstability; Simultaneously on the soil nailing wall, drain hole is set; Drain hole can guarantee the stability of soil nailing wall in time with soil nailing portion's artesian water eliminating within the walls.
Further, the soil nailing of above-mentioned soil nailing wall adopts grouted anchor bar 7, and grouted anchor bar 7 is downward-sloping 10 degree along the deep foundation ditch bottom, and the anchor pole spacing is latticed for 1.5 meters arranges, and forms anchoring soil nailing body of wall with reinforced mesh welding back sprayed mortar that deep foundation pit slope is laid.
Further, above-mentioned drain hole adopts the UPVC pipe, and its length is that 300 millimeters and an end are arranged in the soil nailing body of wall with drainage spun yarn parcel and with the colligation of deep foundation pit slope reinforced mesh, and UPVC manages and becomes latticed along the soil nailing wall by 2 meters spacings and arrange.UPVC manages an end and adopts drainage spun yarn parcel to make it have good worry water-based, and the UPVC pipe is fixed in the soil nailing body of wall.
Adopt this job practices; The large-area deep foundation ditch of drift sand artesian water soil layer can excavate smoothly; The interior no open fire of excavation back deep foundation ditch, excavation slope is stable, even ponding all can penetrate in the substrate sand bed also through pipe well and light well point eliminating very soon in the process heavy rain deep foundation ditch; Soil nailing a small amount of ponding within the walls can be got rid of through drain hole smoothly, has guaranteed the resistance to overturning of body of wall.This method can reduce the excavation of foundation pit area significantly under the prerequisite that does not increase excavation area, effectively control excavation slope stability and precipitation height of water level; Guarantee the excavation of drift sand artesian water soil layer large-area deep foundation pit, reduced difficulty of construction and cost, reduced construction period; Construction technology and Working Procedure Controlling are simple; Adopt no sandpipe well, light well point, soil nailing wall integrated construction, guaranteed excavation of foundation pit and stability of slope, reduced influence surrounding environment.
Claims (3)
1. a drift sand artesian water soil layer large-area deep foundation pit excavation is gone along with sb. to guard him job practices; Drift sand artesian water soil layer be first floor to plough fill stratum, the second layer be argillic horizon, the 3rd layer for silty clay folder powder soil horizon, the 4th layer are powder fine sand layer, it is characterized in that: this method comprises the steps:
The precipitation depth of step 1, deep pit digging is controlled in the following 500-1000 millimeter of excavation face, reduces the influence to the deep foundation ditch surrounding environment;
Step 2, in the deep foundation ditch outer periphery the no sandpipe well of one circle is set, is used for reducing the 4th layer of powder fine sand layer artesian head height, 2 meters on no sandpipe well spacing deep foundation ditch limit, the degree of depth are greater than 6-10 rice bottom the deep foundation ditch, and the spacing of arranging of no sandpipe well is a 15-20 rice;
Step 3, on the inboard side slope of deep foundation ditch, lay reinforced mesh and a circle light well point is set, shutoff underground water infiltrates in deep foundation ditch, keeps the basicly stable of deep foundation pit slope;
On the side slope of silty clay folder powder soil horizon and powder fine sand layer, the soil nailing wall is set behind step 4, the deep pit digging and carries out anchoring, on the soil nailing wall drain hole is set.
2. drift sand artesian water soil layer large-area deep foundation pit excavation according to claim 1 is gone along with sb. to guard him job practices; It is characterized in that: the soil nailing of said soil nailing wall adopts grouted anchor bar; Grouted anchor bar is downward-sloping 10 degree along the deep foundation ditch bottom; The anchor pole spacing is latticed for 1.5 meters arranges, and forms anchoring soil nailing body of wall with reinforced mesh welding back sprayed mortar that deep foundation pit slope is laid.
3. drift sand artesian water soil layer large-area deep foundation pit excavation according to claim 1 and 2 is gone along with sb. to guard him job practices; It is characterized in that: said drain hole adopts the UPVC pipe; Its length is that 300 millimeters and an end are arranged in the soil nailing body of wall with drainage spun yarn parcel and with the colligation of deep foundation pit slope reinforced mesh, and UPVC manages and becomes latticed along the soil nailing wall by 2 meters spacings and arrange.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108824466A (en) * | 2018-06-02 | 2018-11-16 | 北京泽通水务建设有限公司 | A kind of foundation pit side-wall water burst gushes the processing method of sand |
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| CN103835296B (en) * | 2012-11-22 | 2015-10-28 | 浙江海洋学院 | The safeguard structure of polder area deep foundation pit support and construction method thereof |
| CN104947677B (en) * | 2014-03-28 | 2017-04-19 | 中国二十冶集团有限公司 | Rapid cofferdam filling construction method for pit in pit |
| CN105926671B (en) * | 2015-04-29 | 2018-02-27 | 孔志坚 | The basement supporting construction technology of subway station |
| CN105113511B (en) * | 2015-07-20 | 2016-11-30 | 河北二十冶建设有限公司 | Sandstone combines the foundation ditch comprehensive support construction method of soil layer |
| CN105350552A (en) * | 2015-09-25 | 2016-02-24 | 中国二十冶集团有限公司 | Underground water control method for backfilled sediment layer |
| CN110029673B (en) * | 2019-04-16 | 2023-10-13 | 潮峰钢构集团有限公司 | Anchor cable bored pile structure suitable for deep foundation pit support and support method thereof |
| CN110438999A (en) * | 2019-07-30 | 2019-11-12 | 中国葛洲坝集团第一工程有限公司 | A kind of deep basal pit slope excavation construction method of rich groundwater |
| CN111749247A (en) * | 2020-06-30 | 2020-10-09 | 中国二冶集团有限公司 | Construction method for pipeline deep foundation pit support |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2331703Y (en) * | 1998-06-10 | 1999-08-04 | 上海宝钢冶金建设公司第五工程公司 | Miniature well-points dewatering device |
| JP3872094B2 (en) * | 2006-01-18 | 2007-01-24 | Ｊｆｅ建材株式会社 | Liner plate shaft formation method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2331703Y (en) * | 1998-06-10 | 1999-08-04 | 上海宝钢冶金建设公司第五工程公司 | Miniature well-points dewatering device |
| JP3872094B2 (en) * | 2006-01-18 | 2007-01-24 | Ｊｆｅ建材株式会社 | Liner plate shaft formation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108824466A (en) * | 2018-06-02 | 2018-11-16 | 北京泽通水务建设有限公司 | A kind of foundation pit side-wall water burst gushes the processing method of sand |
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